CN203003465U - Limiting and unloading hydraulic clamping device - Google Patents
Limiting and unloading hydraulic clamping device Download PDFInfo
- Publication number
- CN203003465U CN203003465U CN 201320000957 CN201320000957U CN203003465U CN 203003465 U CN203003465 U CN 203003465U CN 201320000957 CN201320000957 CN 201320000957 CN 201320000957 U CN201320000957 U CN 201320000957U CN 203003465 U CN203003465 U CN 203003465U
- Authority
- CN
- China
- Prior art keywords
- piston
- cylinder body
- wall
- clamping device
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a limiting and unloading hydraulic clamping device. The device comprises a piston, a cylinder body and a supporting sleeve, wherein a step-shaped pipe wall is formed on the front outer wall of the piston, an oil pipe port channel is axially formed on the inner wall of the piston and extends out of a step-shaped wall surface, the cylinder body is coaxially sleeved outside the piston, the rear inner wall of the cylinder body is provided with a step-shaped pipe wall which is closely fit with the piston, an oil drainage through hole is formed in the pipe wall of the cylinder body in a distance of Lmax (maximum limiting displacement) from the step surface of the piston, a limiting valve is assembled in the through hole and consists of a ball valve plug, a spring and an adjusting screw, and a damping hole is formed in the adjusting screw of the limiting valve and communicated the outside of the clamping device. In practical work, after high pressure oil is filled into the clamping device, the cylinder body does not move, and the piston shifts to the left; and when the displacement reaches Lmax, the ball valve plug is actuated, and hydraulic oil is discharged through the damping hole in the adjusting screw of the limiting valve, so that the piston stops in a maximum displacement position under an oil supply condition, and the hydraulic clamping device is automatically limited and unloaded.
Description
Technical field
The utility model belongs to the fastener technical field, relates to a kind of hydraulic fastener of realizing the bolt tension fastening effect by hydraulic coupling.
Background technology
Thereby hydraulic fastener is a kind of device of realizing strong fastening that bolt tension elongated and locked by hydraulic coupling, is the effective tool of fastening high-strength bolt.Its operation principle is by means of high pressure hand-operated oil pump, by super high pressure oil pore road, super high pressure oil is injected its cylinder body, make bolt lengthening under the effect of super high pressure oil, produce a displacement gap L, fastening nut between piston and cylinder body, eliminate the gap, therefore when shedding hydraulic coupling, screw rod can not bounce back equally, and very the labour-saving obtains the quite high pretightning force that puts on screw thread pair, thereby reaches the fastening and locking purpose of expection.In hydraulic fastener work, between piston and cylinder body, maximum displacement can not surpass Lmax (referring to accompanying drawing), and when surpassing Lmax, piston can break away from cylinder body, causes hydraulic fastener to lose efficacy.Existing hydraulic fastener can only lean on the red line sign of drawing on the visual piston of operating personnel spacing, but in the hydraulic fastener actual mechanical process, is difficult to hold the spacing of maximum displacement Lmax, therefore also is difficult to guarantee the efficient of hydraulic nut continuous operation.
The utility model content
The purpose of this utility model is the problem that prior art exists is solved, provide a kind of simple in structure, easy to operate, can hold the hydraulic fastener of the spacing spacing off-load of maximum displacement between piston and cylinder body.
the technical solution that adopts for achieving the above object is such: the hydraulic fastener of the spacing off-load that provides comprises piston, , cylinder body, and support set, , piston, external diameter has the stairstepping wall, internal diameter is helicitic texture, piston, upper end edge is axially arranged with the oil filler point passage, cylinder body, coaxial package is at piston, outward, its inwall has and piston, the stairstepping wall of snug fit, and be provided with oil filler point in the side, support set, be sleeved on cylinder body, outer rear portion, have a draining through hole at the cylinder body tube wall apart from the position that the piston step surface is Lmax, said Lmax be piston along the maximum limit distance of positions of cylinder body displacement from, be equipped with one by the ball valve core in through hole, the limit valve that spring and adjustment screw form, have the damping hole that communicates with the fastener external world on the adjustment screw of limit valve, this damping hole can communicate with the external world by draining after the spool of limit valve is opened.
The hydraulic fastener of spacing off-load described in the utility model utilizes hydraulic principle to solve the accurate spacing problem of maximum displacement between piston and cylinder body.In the fastener actual mechanical process, cylinder body is motionless, piston is toward oppositely mobile (left-hand in accompanying drawing), and when displacement reached Lmax, the ball valve core moved, hydraulic oil releases through the damping hole on the limit valve screw, the effect of damping hole is to keep certain pressure in the hydraulic fastener cylinder body, realizes that hydraulic fastener holds the pressure off-load, makes piston in the fuel feeding situation, be parked in maximum displacement Lmax position motionless, thereby realize the automatic spacing off-load of hydraulic fastener.
Description of drawings
Accompanying drawing is the structural representation of a specific embodiment of the utility model.
In accompanying drawing, the title of each number designation is respectively: 1-piston, 2-cylinder body, 3-back-up ring, 4-sealing ring, 5-sealing ring, 6-back-up ring, 7-support set, 8-ball valve core, 9-spring, 10-adjustment screw, 11-damping hole, 12-steel ball, 13-screw plug.
The specific embodiment
Below with reference to accompanying drawing, the utility model content is described further, but actual fabrication structure of the present utility model is not limited in embodiment shown in the drawings.
referring to accompanying drawing, the hydraulic fastener of spacing off-load described in the utility model is by piston 1, the compositions such as cylinder body 2 and support set 7, piston 1 external diameter has the stairstepping wall, internal diameter is helicitic texture, piston 1 upper end edge is axially arranged with the oil filler point passage, cylinder body 2 coaxial packages are outside piston 1, its inwall has the stairstepping wall with piston 1 snug fit, and be provided with oil filler point in the side, support set 7 is sleeved on cylinder body 2 outer rear portion, have a draining through hole at cylinder body 2 tube walls apart from the position that piston 1 step surface is Lmax, a ball valve core 8 is housed in through hole, be equipped with one in the outside of through hole with the adjustment screw 10 of damping hole 11, in adjustment screw 10 and 8 overheads of ball valve core, spring 9 is arranged, by ball valve core 8, spring 9 and adjustment screw 10 have formed the limit valve of this hydraulic fastener.In real work, after hydraulic oil injects fastener, cylinder body 2 is motionless, piston 1 is moved to the left, when displacement reaches Lmax, and 8 actions of ball valve core, hydraulic oil outwards releases through the damping hole 11 on limit valve adjustment screw 10, make piston in the fuel feeding situation, be parked in maximum displacement Lmax position motionless, thereby realize the automatic spacing off-load of hydraulic fastener.
Claims (1)
1. the hydraulic fastener of a spacing off-load, comprise piston (1), cylinder body (2) and support set (7), it is characterized in that: piston (1) external diameter has the stairstepping wall, internal diameter is helicitic texture, piston (1) upper end edge is axially arranged with the oil filler point passage, cylinder body (2) coaxial package is outside piston (1), its inwall has the stairstepping wall with piston (1) snug fit, and be provided with oil filler point in the side, support set (7) is sleeved on cylinder body (2) outer rear portion, have a draining through hole at cylinder body (2) tube wall apart from the position that piston (1) step surface is Lmax, said Lmax be piston (1) relatively cylinder body (2) displacement the maximum limit distance of positions from, be equipped with one by ball valve core (8) in through hole, the limit valve that spring (9) and adjustment screw (10) form, have the damping hole (11) that communicates with the fastener external world on the adjustment screw (10) of limit valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320000957 CN203003465U (en) | 2013-01-05 | 2013-01-05 | Limiting and unloading hydraulic clamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320000957 CN203003465U (en) | 2013-01-05 | 2013-01-05 | Limiting and unloading hydraulic clamping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203003465U true CN203003465U (en) | 2013-06-19 |
Family
ID=48595098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320000957 Expired - Fee Related CN203003465U (en) | 2013-01-05 | 2013-01-05 | Limiting and unloading hydraulic clamping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203003465U (en) |
-
2013
- 2013-01-05 CN CN 201320000957 patent/CN203003465U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104235251B (en) | A kind of stroke adjustable dual-drum multi-cavity type gas spring | |
| CN102367857A (en) | Adjustable force type hydraulic damper | |
| CA2704401A1 (en) | T-600 gas braking tool | |
| CN203003465U (en) | Limiting and unloading hydraulic clamping device | |
| CN201606326U (en) | Electro-hydraulic inching valve | |
| CN202125484U (en) | Large-flow high-pressure oil cylinder provided with unloading buffering mechanism | |
| CN203009527U (en) | Limit unloading hydraulic nut | |
| CN103470552A (en) | Hydraulic system with buffer function | |
| CN203889992U (en) | Hydraulic jack | |
| CN103486108B (en) | A kind of cylinder with two self-locking structure | |
| CN204024587U (en) | Well mouth oil pipe relief valve | |
| CN202732531U (en) | Furnace cover oil cylinder with function of rear buffering | |
| CN202612248U (en) | Combined-type hydraulic cylinder | |
| CN202971410U (en) | Double-stroke cylinder | |
| CN203962545U (en) | A kind of quick die cylinder for high speed die casting machine | |
| CN202971394U (en) | Stroke-adjustable air cylinder mechanism | |
| CN206860586U (en) | A kind of cylinder structure | |
| CN202883548U (en) | Grate cooler buffering device | |
| CN204186676U (en) | Oil cylinder of hydraulic headstock gear locking device | |
| CN203584962U (en) | Improved structure of buffer oil cylinder device | |
| CN203308822U (en) | Hydraulic cylinder | |
| CN204403007U (en) | A kind of high three door frame oil circuits hoisted | |
| CN203594641U (en) | Improved structure of lifting cylinder base one-way valve | |
| CN203453159U (en) | Hydraulic system with buffer function | |
| CN204041833U (en) | A kind of damping oil cylinder for medium-heavy automobile driver's cab turnover |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20140105 |